BE50003 The waterproof OP-LA Reflex belongs to the class of the most compact red-dot sights, which makes it ideal for pistols. The model is parallax free at a distance of 50 yards. The distinctive feature of OP-LA Reflex is a photo-sensor that automatically turns the device "ON" when the protective cap is lifted. Also, the sensor automatically adjusts the brightness of the dot according to the ambient light conditions. Features: -OP-LA reflex. -Shock-proof. -Ultra compact. -Waterproof. -Suitable for all calibers. -Multi-coated optics. -Standard mount Weaver MIL-STD-1913. -Simplicity of operation. -Quick target acquisition. -Unlimited eye relief. -Reticle automatic brightness control. Specifications: -Reticle color: Red. -Reticle type: 5 Center Dot Reticle. -Water intrusion: Meets IPX5 rating. -Magnification: 1.0x. -Objective lens diameter (mm): 25x18. -FOV at distance 110 yards (ft/m): 33 / 10. -Focus range (yards): 0.5 to infinity. -Parallax setting (yard/m): 50 / 46. -Power supply: 3V (one CR2032 or DL2032 or ECR2032). -Estimated battery life (hour): 300. -Operating temperature (°F/°?): -4° to +122°/ -20° to +50°. -Humidity: Up to 98pct. -Weight (oz/g): 2.47 / 70. -Dimensions: 1.45" H x 1.97" W x 1.34" D.